16GB KIT (4 x 4GB) for Intel W Series WX58BP (ECC Unbuffered). DIMM DDR3 ECC Unbuffered PC3-10600E 1333MHz Dual Rank Server Ram Memory. Genuine A-Tech Brand. at Amazon.com
ecc - Does fully buffered memory have a different notch position? - Server Fault
Crucial 8GB DDR3 SDRAM Memory Module - Newegg.com
Unbuffered versus Registered ECC Memory - Difference between ECC UDIMMs and RDIMMs